Properties of the Number 31858

Thirty-One Thousand Eight Hundred Fifty-Eight

Basics

Value: 31857 → 31858 → 31859

Parity: even

Prime: No

Previous Prime: 31849

Next Prime: 31859

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 17 × 937

Divisors: 1, 2, 17, 34, 937, 1874, 15929, 31858

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111110001110010

Octal: 76162

Duodecimal: 1652A

Hexadecimal: 7c72

Square: 1014932164

Square Root: 178.48809484108457

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k) is the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A235248

Number of (n+1) X (3+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A235243

Number of planar graphs with n nodes and chromatic number 4. A164101

Number of (n+1) X (n+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A235240

Number of points on surface of octahedron; also coordination sequence for cubic lattice: a(0) = 1; for n > 0, a(n) = 4n² + 2. A5899

Square array A(n, k) = 2·A246278(n, k) - σ(A246278(n, k)), read by falling antidiagonals. Deficiency applied to the prime shift array. A378979

G.f. A(x) satisfies: A(x)² - 2·A(x)³ = A(x²). A273095

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones. A31858